CN215842470U - Production system for preparing vaterite gelled building raw materials by using carbon capture technology - Google Patents
Production system for preparing vaterite gelled building raw materials by using carbon capture technology Download PDFInfo
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- CN215842470U CN215842470U CN202122264101.8U CN202122264101U CN215842470U CN 215842470 U CN215842470 U CN 215842470U CN 202122264101 U CN202122264101 U CN 202122264101U CN 215842470 U CN215842470 U CN 215842470U
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Abstract
The utility model belongs to the technical field of carbon neutralization, flue gas treatment and building materials, and particularly relates to a production system for preparing vaterite gelled building raw materials by using a carbon capture technology. The utility model has the beneficial effects that: the technology of the utility model can capture and solidify CO2 in the industrial flue gas through the alkaline solid waste, convert CO2 into the inorganic high-efficiency gelled material, can be used for manufacturing building materials, realizes the retreatment and utilization of carbon dioxide and the solid waste, has simple and easily realized process and reaction, and has higher economic value.
Description
Technical Field
The utility model belongs to the technical field of carbon neutralization, flue gas treatment and building materials, and particularly relates to a production system for preparing vaterite gelled building raw materials by using a carbon capture technology.
Background
Carbon Capture (CCS) is a process in which carbon dioxide in industrial production is captured by various means and then stored or utilized. The existing carbon capture technology is difficult to recycle and expensive in cost. In the prior art, when the CO2 treatment is carried out by using a carbon capture technology, CO2 in industrial flue gas is generally captured into a solution by an additive, and CO2 in the solution is released in a gas form and concentrated and purified in a high-energy-consumption mode. The purified CO2 is solidified and buried, or used as raw material of other food and chemical industry products. Since the food and chemical industries have extremely high requirements for the purity of raw materials, the cost of concentration and purification thereof is expensive. While the disposal of solid landfills is costly and may risk secondary escape.
Calcium carbonate is an inorganic filler with a wide application range, can be widely applied to the industrial fields of papermaking, rubber, building materials, coatings and the like, particularly has wide application in the building industry, and has the characteristic of cementation only when common inorganic materials are mixed with materials such as clay and the like to prepare cement.
At present, a production system for recovering carbon dioxide and solid wastes in flue gas and directly obtaining gelled building raw materials capable of replacing cement still does not exist.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a production system for preparing the vaterite gelled building raw material by using a carbon capture technology, CO2 in the solidified industrial flue gas can be captured by using alkaline solid wastes through the technology of the utility model, CO2 is converted into an inorganic high-efficiency gelled material, the inorganic high-efficiency gelled material can be used for building material manufacture, the retreatment and utilization of carbon dioxide and solid wastes are realized, the industrial system is simple, the reaction is easy to realize, and the economic value is higher.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a production system for preparing vaterite gelled building raw materials by utilizing a carbon capture technology is characterized in that: the system comprises a pulping system, an absorption tower system and a solid-liquid separation system, wherein the pulping system is connected with the upper part of the absorption tower system, an absorbent of the pulping system is sent into the absorption tower, the bottom of the absorption tower system is connected with the solid-liquid separation system, the serous fluid of the absorption tower is sent into the solid-liquid separation system for reaction and separation, the solid-liquid separation system is connected with the pulping system, and the separated solution returns to the absorption tower system again through the pulping system;
the absorption tower system comprises an absorption tower, a flue gas inlet is formed in the absorption tower, a spraying layer connected with the pulping system is arranged above the inside of the absorption tower, a demister located in the absorption tower is arranged above the spraying layer, and an absorption tower chimney is arranged at the top of the absorption tower;
the solid-liquid separation system comprises a crystallization device, the crystallization device is connected with the bottom of the absorption tower, slurry obtained after carbon dioxide is absorbed at the bottom of the absorption tower is sent to the crystallization device, and liquid obtained by crystallization of the crystallization device is sent to the absorption tower again through the pulping system.
The crystallization device comprises a cooling crystallization system, an evaporative crystallization system and a wastewater treatment tank, wherein an inlet of the cooling crystallization system is connected with the bottom of the absorption tower, liquid at the bottom of the absorption tower is pumped to the cooling crystallization system, a liquid outlet of the cooling crystallization system is connected with an inlet of the evaporative crystallization system, a gas outlet of the evaporative crystallization system is connected with the wastewater treatment tank, the wastewater treatment tank is connected with a pulping system, and the pulping system sends an absorbent into the absorption tower.
The solid-liquid separation system further comprises a plate frame filter pressing device, the plate frame filter pressing device is located between the crystallizing device and the absorption tower, the plate frame filter pressing device comprises a plate frame filter press and a clear liquid water tank, the liquid inlet end of the plate frame filter press is connected with the lower portion of the absorption tower, the liquid outlet end of the plate frame filter press is connected with the clear liquid water tank, and the clear liquid water tank is connected with the cooling crystallizing system of the crystallizing device.
The pulping system comprises a pulping pit, a pit stirrer arranged in the pulping pit and a metering system positioned above the pulping pit, wherein the pulping pit conveys an absorbent to the absorption tower through a slurry supply pump.
The bottom of the absorption tower is connected with the spraying layer through a self-circulation pipeline and an absorption tower circulating pump arranged on the self-circulation pipeline; and a branch flue gas pipeline is arranged on a pipeline connected with the flue gas inlet of the absorption tower, and a standby chimney is arranged on the branch flue gas pipeline. In case of failure of the absorption system, the flue gas is discharged from the standby chimney.
An absorption tower stirrer is arranged in the absorption tower.
The system comprises a pulping system, an absorption tower system and a solid-liquid separation system, and is characterized by further comprising a process water system, wherein the process water system is respectively connected with the pulping system, the absorption tower system and the solid-liquid separation system through pipelines, the process water system comprises a process water tank, and a process water pipeline, a demister flushing water pipeline, a cooling water pipeline, a process water return pipeline and a cooling water return pipeline which are connected with the process water tank, the process water pipeline and the process water return pipeline are connected with the pulping system, the demister flushing water pipeline is connected with a demister of the absorption tower, and the cooling water pipeline and the cooling water return pipeline are connected with the crystallization system.
The utility model has the beneficial effects that:
the spraying layer of the absorption tower is used for spraying and capturing carbon dioxide, and the demister is used for capturing and collecting mist volatilized in the spraying process, so that the carbon dioxide can be captured to the maximum extent, and the flue gas discharged from a chimney of the absorption tower is relatively pure; the absorbent in the absorption tower can be repeatedly used through the self-circulation pipeline, and the absorbent separated by crystallization is recovered and then is reused for absorbent preparation, so that the absorption and reutilization are realized; the agitator in the absorber column accelerates the capture of free carbon dioxide in the bottoms liquid by the absorbent. The cooling crystallization system is used for carbon dioxide further carbon solidification reaction and primary crystallization of solid-liquid separation of products. And a cooling crystallization system and an evaporative crystallization system are arranged at the same time, and the obtained product is purer by carrying out crystallization twice.
The whole production system of the utility model can capture the carbon dioxide of the industrial flue gas by using a carbon capture technology, and utilize the alkaline raw materials of the solid waste to react with the carbon dioxide to generate a gelling agent, and generate byproduct vaterite CaCO3 (V type) particles while the flue gas and the solid waste are treated; the resources are utilized to the maximum extent, the environment is controlled, energy is saved, emission is reduced, the problem that carbon dioxide is easy to escape after being captured is solved, and the national green and environment-friendly requirements are met.
The production system has simple structure of each part, low requirement on production equipment, allowable water in the system and simple and uncritical reaction conditions. The waste gas and solid waste are used as raw materials, so that the production cost is low, the economic value and the social value are extremely high, the device is sustainable, recyclable, practical and applicable to large-scale popularization, and the popularization and implementation of carbon peak reaching and carbon neutralization are facilitated.
The vaterite obtained by the system is a water-based cementing material, has the characteristics of gradually converting latex into uniform semi-rigid solid gel and keeping the original shape, can be directly used as a building material instead of cement, and can be applied to light building materials because the vaterite obtains larger specific surface area, higher dispersion performance and smaller specific gravity in the crystallization and dehydration process, so that the vaterite can effectively reduce the consumption of the cement in the building materials, and the energy and environment consumption brought by cement manufacture can be reduced. Meanwhile, the building material manufactured by using the vaterite CaCO3 (V-shaped) particles can effectively reduce the weight of the building material and the overall energy consumption.
Drawings
FIG. 1 is a schematic flow diagram of a production system according to the present invention.
In the figure: the system comprises a flue gas inlet 1, a main exhaust fan 2, a branch flue gas pipeline 3, a chimney bypass damper plate 4, a standby chimney 5, a main flue damper plate 6, a slurry supply pump 7, an absorption tower 8, a spraying layer 9, a demister 10, an absorption tower chimney 11, an absorption tower stirrer 12, a self-circulation pipeline 13, an absorption tower circulating pump 14, a slurry discharge pump 15, a plate and frame filter press 16, a clear liquid water tank 17, a cooling crystallization system 18, an evaporative crystallization system 19, a wastewater treatment tank 20, a process water tank 21, a process water pump 22, a demister washing water pump 23, a cooling water pump 24, a pulping chamber 25, an automatic bale breaker 26, a feeding powder bin 27, a screw feeder 28, a pulping pit 29 and a pit stirrer 30.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model provides a production system for preparing vaterite gelled building raw materials by utilizing a carbon capture technology, and referring to a schematic structural diagram shown in figure 1, the production system comprises an absorption tower system, a solid-liquid separation system, a pulping system and a process water system, wherein the pulping system is used for preparing a carbon dioxide absorbent, the absorption tower system is used for capturing and collecting carbon dioxide in industrial flue gas and converting the carbon dioxide into a carbon dioxide reservoir material CO2SM, and the solid-liquid separation system is used for converting the carbon dioxide reservoir material CO2SM into the vaterite CaCO3 gelled building raw materials on one hand and separating the materials from an absorbent on the other hand. The process water system provides process water and cooling water for each equipment in the use process.
The pulping system is connected with the upper part of the absorption tower system, absorbent of the pulping system is sent into the absorption tower 8, the bottom of the absorption tower system is connected with the solid-liquid separation system, slurry discharged from the bottom of the absorption tower 8 enters the solid-liquid separation system, reacts in the solid-liquid separation system and completes solid-liquid separation through crystallization, the solid-liquid separation system is connected with the pulping system, and solution obtained through solid-liquid separation returns to the absorption tower system again through the pulping system to be sprayed.
The absorption tower system can be a wet spraying gas-liquid collection system, and can also be a gas-liquid collection system such as an aeration method, and the embodiment takes the wet spraying gas-liquid collection system as an example, the absorption tower system comprises an absorption tower 8, the middle part of the absorption tower 8 is provided with a flue gas inlet 1, flue gas enters the absorption tower 8 from the flue gas inlet 1 through a main exhaust fan 2, and a main flue damper plate 6 is arranged on a pipeline to be used as a switch to control whether the flue gas is introduced; in order to prevent the absorption tower system from being broken down, a branch flue gas pipeline 3 is further arranged on a pipeline connected with a flue gas inlet 1 of the absorption tower 8, a standby chimney 5 is arranged on the branch flue gas pipeline 3, a chimney bypass damper plate 4 is installed on the branch flue gas pipeline 3 and serves as a switch, and when the absorption tower system is broken down, flue gas flows out from the standby chimney 5.
A plurality of spraying layers 9 are arranged above the inner part of the absorption tower 8, the spraying layers 9 can fully cover all areas of the flue gas, and the flue gas inlet 1 is arranged below the spraying layers 9. The spraying layer 9 is used for spraying an absorbent, the slurry supply pump 7 is arranged on a connecting pipeline between the slurry preparation system and the spraying layer 9, the absorbent can be pumped to the spraying layer 9, and the absorbent is sprayed down from the spraying layer 9 to absorb carbon dioxide in the flue gas. The gas-liquid ratio of the flow of the spraying absorbent to the flow of the flue gas is generally between 0.5 and 2. Spray layer 9 top and install the defroster 10 that is located absorption tower 8, some because the volatile fog of solution higher temperature catches through defroster 10 and collects to regularly wash defroster 10 with water, water carries to defroster 10 from process water tank 21 of process water system through defroster scavenging pump 23, and the washing liquid all falls into the tower bottom with spraying liquid. An absorption tower chimney 11 is also arranged at the top of the absorption tower 8, and purified gas after absorbing carbon dioxide is discharged from the absorption tower chimney 11 at the top of the tower; the bottom of the absorption tower 8 is connected to a solid-liquid separation system by a slurry discharge pump 15, and the liquid having been absorbed (when the pH value is lowered to 6 to 7) is sent to the solid-liquid separation system by the slurry discharge pump 15. The production of the vaterite CaCO3 gelled building raw material and the solid-waste separation are completed in a solid-liquid separation system, and the liquid of the solid-liquid separation is reused.
In order to save cost and improve the absorption rate of the absorbent, a self-circulation pipeline 13 is arranged between the bottom of the absorption tower 8 and the spraying layer 9, an absorption tower circulating pump 14 is arranged on the self-circulation pipeline 13, and the absorbent is recycled through the absorption tower circulating pump 14 and the self-circulation pipeline 13; an absorber stirrer 12 may be installed in the absorber 8 to sufficiently mix the bottom gas and the liquid to accelerate the absorption.
The solid-liquid separation system comprises a crystallization device, the crystallization device is connected with the absorption tower 8, so that the solution at the bottom of the absorption tower 8 enters the crystallization device, and the liquid obtained by crystallization of the crystallization device enters the absorption tower 8 again through the pulping system for spraying.
The crystallizing device can use a mode of evaporative crystallization or cooling crystallization and plate frame crystallization. The crystallization device of this embodiment includes evaporation crystallization system 19, cooling crystallization system 18 and waste water treatment tank 20, the entry and the absorption tower 8 end of cooling crystallization system 18 are connected, liquid pump to cooling crystallization system 18 at the bottom of through thick liquid discharge pump 15, the liquid export and the 19 entry linkage of evaporation crystallization system of cooling crystallization system 18, the condensate export and the waste water treatment tank 20 of evaporation crystallization system 19 are connected, waste water treatment tank 20 is connected with slurrying system, the solution in waste water treatment tank 20 gets into slurrying system, and send into absorption tower 8 through slurrying system with the absorbent, the recycle of absorbent has been realized. Solid waste containing CaO or Ca (OH) 2 alkaline mineral materials, such as hydrated lime, carbide slag and the like, preferably calcium carbide, is added into the cooling crystallization system 18, reaction and cooling crystallization at normal temperature are carried out, and carbon solidification is carried out on carbon dioxide. The cooling water pump 24 is used for supplying cooling water to the crystal when the crystal is cooled. Crystallization is then carried out again by the evaporative crystallization system 19, yielding vaterite CaCO3 (V-type) particles, which can be used as a building raw material in the construction industry.
If a purer vaterite gelled material is needed, some insoluble particles in the liquid are filtered, the liquid can be selectively separated by a plate-and-frame filter pressing device, and a small amount of removed solid is stored in a slag warehouse for clearing. At this time, the solid-liquid separation system of the present invention should further include a plate-and-frame filter pressing device, the plate-and-frame filter pressing device should be disposed in front of the crystallization device and located between the crystallization device and the absorption tower 8, the plate-and-frame filter pressing device includes a plate-and-frame filter press 16 and a clear water tank 17, a liquid inlet end of the plate-and-frame filter press 16 is connected to the bottom of the absorption tower 8 through a slurry discharge pump 15, the slurry in the absorption tower 8 is discharged from the bottom and then enters the plate-and-frame filter press 16 for filter pressing, a liquid outlet end of the plate-and-frame filter press 16 is connected to the clear water tank 17, the clear water tank 17 is then connected to a cooling crystallization system 18 of the crystallization device, the filtrate obtained by the plate-and-frame filter pressing is sent to the cooling crystallization system 18 for evaporative crystallization, and cooled and crystallized at normal temperature. Similarly, a basic mineral material containing CaO or Ca (OH) 2 is fed into the cooling crystallization system 18 to be solidified by carbon capture. The crystallized solution returns to the absorption tower 8 system for carbon collection through the pulping system.
If the vaterite is used as raw materials of general building materials, a plate-frame filter pressing device is not required to be selected, the system is simplified, and the operation cost is reduced.
The pulping system of the present embodiment is disposed in the pulping room 25 and is used for completing the preparation of the absorbent, and includes a pulping pit 29, a pit stirrer 30 disposed in the pulping pit 29, a metering system, such as a metering pump (not shown in the figure), disposed above the pulping pit 29, and a screw feeder 28. The absorbent is dosed into the slurrying pit 29 by a metering system and added with water and stirred evenly by a pit stirrer 30. When the liquid preparation is used, the catching agent is directly added and uniformly mixed in proportion through a metering system such as a metering pump, and water is added for dilution; when the powdery preparation is used, the package is removed by the automatic bale breaker 26, and then the powdery preparation enters a metering system such as a screw feeder 28 through a feeding powder bin 27, the carbon capture agents are mixed in proportion by the screw feeder 28, and water is added by a metering pump to be stirred in a pulping pit 29, so that the solid carbon capture agents are uniformly mixed, and the prepared absorbent is pumped to the absorption tower 8 by a slurry supply pump 7.
The production system also comprises a process water system, the process water system is respectively connected with the pulping system, the absorption tower system and the solid-liquid separation system through pipelines, the process water system comprises a process water tank 21, and a process water pipeline, a demister flushing water pipeline, a cooling water pipeline, a process water return pipeline and a cooling water return pipeline which are connected with the process water tank 21, the process water pipeline and the process water return pipeline are connected with the pulping system, the demister flushing water pipeline is connected with a demister 10 of the absorption tower 8, and the cooling water pipeline and the cooling water return pipeline are connected with the crystallization system. And water supply and return water receiving are provided for each process route.
The utility model can be used for treating industrial flue gas, such as flue gas of fermentation, chemical industry, power plants, steel mills and the like. The flue gas with high CO2 content and low other waste gas source can be directly treated by the system. For the high SO2 and NOx, a desulfurization and denitration system can be used for pretreating the flue gas at the front end of the system to meet the current atmospheric emission requirement. This system is then used for carbon collection in flue gases.
The technological process of producing the vaterite gel building raw material by using the production system comprises the following steps:
preparing a carbon dioxide absorbent by using a pulping system, and supplying water for the pulping system from a process water tank 21 by using a process water pump 22; introducing industrial flue gas containing carbon dioxide into an absorption tower 8 from a flue gas inlet 1 by using a main exhaust fan 2, pumping an absorbent of a pulping system to a spraying layer 9 of the absorption tower 8 by using a slurry supply pump 7 for spraying, and controlling the gas-liquid ratio of the flow of the spraying absorbent to the flow of the flue gas to be between 0.5 and 2; the volatilized mist is captured and collected by a demister 10 in the absorption tower 8; the clean flue gas passing through the demister 10 is discharged from a chimney on the tower of the absorption tower 8, the demister 10 is cleaned by water in the period, the water is conveyed to the demister 10 from a process water tank 21 of a process water system through a demister cleaning pump 23, cleaning liquid enters the bottom of the tower, and the clean flue gas, an absorbent and a carbon dioxide storage material CO2SM enter a solid-liquid separation system together after the reaction is finished (the pH value of slurry is reduced to 6-7); the slurry sprayed in the absorption tower 8 is pumped from the bottom of the tower back to the absorption tower 8 for spraying again.
The slurry discharged from the bottom of the absorption tower 8 is pumped into a solid-liquid separation system by a slurry discharge pump 15 to be reacted and crystallized. The method specifically comprises the following steps: in order to obtain the vaterite gelled material with higher purity, the reaction is filtered, the liquid at the bottom of the absorption tower 8 is pumped to a plate-and-frame filter press 16, a small amount of solid existing in the liquid is removed after the liquid is subjected to filter pressing, and the filtrate enters a clear liquid water tank 17. The filtrate is passed to a cooling crystallization system 18 where solid waste containing CaO or ca (oh) 2 basic mineral material is added for reaction and crystallization. The reacted system is then cooled and crystallized at normal temperature in a cooling and crystallizing system 18, and cooling water is supplied from a process water tank 21 by a cooling water pump 24. The separated liquid enters an evaporative crystallization system 19 and is subjected to evaporative crystallization at the temperature of 120-180 ℃. Obtaining vaterite CaCO3 (V type) particles, namely the vaterite gelled building raw material; and recovering the crystallized solution, buffering the solution in a wastewater treatment pool 20, and re-entering a pulping system for capturing carbon dioxide.
Compared with portland cement (complex polycrystalline phase reaction during preparation, the portland cement is alkaline, corrodes fibers, shrinks and lasts during reaction), the vaterite cementing material obtained by the production system has simple reaction, short maintenance period and neutral PH, is suitable for various fibers, and can select cheaper materials during preparation of light boards; and the size stability is good, and the cement can be directly added into building materials to be used instead of 5 to 100 percent of cement.
The present invention has been described in detail with reference to the examples, but the present invention is only preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (7)
1. A production system for preparing vaterite gelled building raw materials by utilizing a carbon capture technology is characterized in that: the system comprises a pulping system, an absorption tower system and a solid-liquid separation system, wherein the pulping system is connected with the upper part of the absorption tower system, an absorbent of the pulping system is sent into the absorption tower, the bottom of the absorption tower system is connected with the solid-liquid separation system, slurry in the absorption tower system is sent into the solid-liquid separation system for reaction and separation, the solid-liquid separation system is connected with the pulping system, and the separated solution returns to the absorption tower system again through the pulping system;
the absorption tower system comprises an absorption tower, a flue gas inlet is formed in the absorption tower, a spraying layer connected with the pulping system is arranged above the inside of the absorption tower, a demister located in the absorption tower is arranged above the spraying layer, and an absorption tower chimney is arranged at the top of the absorption tower;
the solid-liquid separation system comprises a crystallization device, the crystallization device is connected with the bottom of the absorption tower, slurry obtained after carbon dioxide is absorbed at the bottom of the absorption tower is sent to the crystallization device, and liquid crystallized by the crystallization device is sent to the absorption tower again through the pulping system.
2. The production system according to claim 1, wherein: the crystallization device comprises a cooling crystallization system, an evaporative crystallization system and a wastewater treatment tank, wherein an inlet of the cooling crystallization system is connected with the bottom of the absorption tower, liquid at the bottom of the absorption tower is pumped to the cooling crystallization system, a liquid outlet of the cooling crystallization system is connected with an inlet of the evaporative crystallization system, a gas outlet of the evaporative crystallization system is connected with the wastewater treatment tank, the wastewater treatment tank is connected with a pulping system, and the pulping system sends an absorbent into the absorption tower.
3. The production system according to claim 2, wherein: the solid-liquid separation system further comprises a plate frame filter pressing device, the plate frame filter pressing device is located between the crystallizing device and the absorption tower, the plate frame filter pressing device comprises a plate frame filter press and a clear liquid water tank, the liquid inlet end of the plate frame filter press is connected with the lower portion of the absorption tower, the liquid outlet end of the plate frame filter press is connected with the clear liquid water tank, and the clear liquid water tank is connected with the cooling crystallizing system of the crystallizing device.
4. The production system according to claim 1, wherein: the pulping system comprises a pulping pit, a pit stirrer arranged in the pulping pit and a metering system positioned above the pulping pit, wherein the pulping pit conveys an absorbent to the absorption tower through a slurry supply pump.
5. The production system according to claim 1, wherein: the bottom of the absorption tower is connected with the spraying layer through a self-circulation pipeline and an absorption tower circulating pump arranged on the self-circulation pipeline.
6. The production system according to claim 1, wherein: and a branch flue gas pipeline is arranged on a pipeline connected with the flue gas inlet of the absorption tower, and a standby chimney is arranged on the branch flue gas pipeline.
7. The production system according to claim 1, wherein: an absorption tower stirrer is arranged in the absorption tower.
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| CN114849445A (en) * | 2022-03-22 | 2022-08-05 | 孙刚 | Method for cooperating pretreatment of industrial solid waste and carbon capture of flue gas |
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